A floor call I had never seen

[RR]

It is pretty rare that something happens in a poker room I have never seen. I was called to an Omaha game tonight because the dealer had flashed a player's card (no big deal it would become the burn), dealt around and instead of giving the button his fourth card he dealt it to replace the exposed card. I got to the table and there had been a raise and a call and the button pointed out he only had 3 cards. I won't mention what I ruled because that would alter the discussion, but I am interested in what others think should happen.